I'm a C++ developer, not a frontend developer. I can debug C++ executables, because of debug symbols and gdb. I generally don't need to know any assembly for debugging.
If Svelte is compiles down to JS where the connection between the compiled down code and the source code is unclear then maybe they need similar tooling to address this.
If Svelte is compiles down to JS where the connection between the compiled down code and the source code is unclear then maybe they need similar tooling to address this.